Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aca18484260a03e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 15:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e31e1f4d1b96bdbedf65e7ade913b63f SHA-1: 20520f2b35d7ea565299e71b5285ff08abb6fbfa SHA-256: 1aca18484260a03e398cb7b291880a932d9d388eaf2c3d37c4a116f4d2cd64f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple embedded URLs point to suspicious PDF files on unknown domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ideviceplus.be/app/webroot/files/userfiles/files/57834593261.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbf381ef0---88863710519.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/94982286820.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/43478909117.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/mefuxisadabowakaf.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/38423446646.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11291319668.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bavakokesim.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/vekoxazegowerazoma.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/jamakakironu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/83319274043.pdfIn PDF document text
    • http://forti.in/userfiles/file/13304114147.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/17962485591.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/revoxuvasukabasig.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/fipexunepud.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kifuzogilupiwa.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/18a6744961e5645ff04f3370d2c05447/lokagakozemosabiboza.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/libinugi.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/27406197098.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/7122372955.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/gofesesinujuduxipapam.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/dumelel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=haryana+education+boardPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 10492 bytes
SHA-256: 32dff86b3173844ac2d887368f9fd6478de13913e171b2254857bd942912137a
font_01_sfnt_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 19280 bytes
SHA-256: 16dddb5b26fe488856c94dcb43b1bb86337d2598cfc60a4845513dd003690b0d

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